Connected: An Internet Encyclopedia
RFC 1422 - 3.3.1 Version Number

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### 3.3.1 Version Number

The version number field is intended to facilitate orderly changes in certificate formats over time. The initial version number for certificates used in PEM is the X.509 default which has a value of zero (0), indicating the 1988 version. PEM implementations are encouraged to accept later versions as they are endorsed by CCITT/ISO.

Next: 3.3.2 Serial Number

Connected: An Internet Encyclopedia
RFC 1422 - 3.3.1 Version Number